Frank keeps his pet iguana in a glass tank that is shaped like a rectangular prism.
The height of the tank is 11 inches, the width is 35 inches, and the length is 25 inches.
He has a chance to buy a new tank, that is also shaped like a rectangular prism. The height of the new tank is 13 inches, the width is 32 inches, and the length is 28 inches. Which tank has a greater volume? How much greater is its volume?

Statements reasons 1. ab ? cd; ad ? bc 1. given 2. ac ? ac 2. reflexive property 3. ? adc ? ? cba 3. ? 4. ? dac ? ? bca; ? acd ? ? cab 4. cpctc 5. ? dac and ? bca are alt. int. ? s; ? acd and ? cab are alt. int. ? s 5. definition of alternate interior angles 6. ab ? cd; ad ? bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?